I have a laptop running WIndows 8.1 and Windows 10 Dual boot (I Installed Windows 10 last). Both are encrypted with BitLocker.
I want to remove the Windows 8.1 OS, Partition , and remove it from the boot menu.
Is this possible?
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Removing Windows 8.1 from Boot
From Windows 10, start
MSCONFIG utitlity. (Use Run box (Win+R))
Boot tag, and remove any unnecessary boot entry from there. If there is only a single entry, while Booting, Windows won't bother showing 30-seconds display to choose boot device.
Disk Management, Right Click on Computer>Manage>Disk Management, Right Click on Windows 8.1 partition and use
Delete Volume option.
To remove the ability to choose which OS to boot. Do this in your main OS you want. Now I haven't played with Win10 yet. But in Win 7 & 8 in control panel -> System. Click on Settings button
In "Startup and Recovery" uncheck "Time to display list of OS". Ensure you choose from the drop down list the OS you want to load by default.
If you use a Partition Manager to reclaim the other partition ensure you backup your HD at the partition level in the event you remove the ability to boot to the OS of your choice and need to recover.
Proceed with caution!! Use GParted and you should be able to delete a partition you don't want, re-size, etc. and fully supports NTFS. Be sure you have a good backup first. There are other packages that do this, but GParted will require you to use a boot CD to do this. You will not be able to re-size an in-use partition.
You can edit the menu from Computer Properties to change what partition boots first..